Luminosity-Colours relations for thin disc main-sequence stars

TL;DR

This paper provides new optical and near-infrared absolute magnitude calibrations for thin disc main-sequence stars, aiding in distance estimation and galactic structure studies.

Contribution

It introduces updated calibrations for a wide spectral range using Hipparcos data and discusses effects of binaries and evolved stars on these calibrations.

Findings

Calibrations cover spectral types A0 to M4 (optical) and A0 to M0 (near-infrared).

Binary and evolved stars influence the absolute magnitude calibrations.

Calibrations can improve galactic model parameter estimations.

Abstract

In this study we present the absolute magnitude calibrations of thin disc main-sequence stars in the optical ($M_{V}$), and in the near-infrared ($M_{J}$). Thin disc stars are identified by means of Padova isochrones, and absolute magnitudes for the sample are evaluated via the newly reduced Hipparcos data. The obtained calibrations cover a large range of spectral types: from A0 to M4 in the optical and from A0 to M0 in the near-infrared. Also, we discuss the of effects binary stars and evolved stars on the absolute magnitude calibrations. The usage of these calibrations can be extended to the estimation of galactic model parameters for the thin disc individually, in order to compare these parameters with the corresponding ones estimated by $\chi{^2}_{min}$ statistics (which provides galactic model parameters for thin and thick discs, and halo simultaneously) to test any degeneracy between them. The calibrations can also be used in other astrophysical researches where distance plays an important role in that study.